root/tools/testing/selftests/bpf/progs/fd_htab_lookup.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2025. Huawei Technologies Co., Ltd */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>

char _license[] SEC("license") = "GPL";

struct inner_map_type {
        __uint(type, BPF_MAP_TYPE_ARRAY);
        __uint(key_size, 4);
        __uint(value_size, 4);
        __uint(max_entries, 1);
} inner_map SEC(".maps");

struct {
        __uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
        __uint(max_entries, 64);
        __type(key, int);
        __type(value, int);
        __array(values, struct inner_map_type);
} outer_map SEC(".maps") = {
        .values = {
                [0] = &inner_map,
        },
};